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Assuming you're trying to power the monitors from this unit as well as the mains.....Confirm that the amp switch is in the middle position which splits the internal amps....one for main and one for monitors. Output A would power the monitors.... B would power the mains.
A couple of things to think about. If the radio is new, then the speakers may be bad. If the radio is not new and purchased from someone else, the radio may be bad. You are making sure the volume is turned up right? You did use a harness when hooking the radio up right? That is something I strongly recommend.
I can relate to your connection problem. Go back over the whole thing, making sure input and output connections are correct. It is very easy to make a mistake where complex arrangements are involved. It might help to temporarily label the various wires.
there is a bad ground.
the hum you are hearing is ac getting into the audio.check all the rca plugs on the set are plugged in all the way.do not run them close to a power bar either.
sometimes a second unit with it's own volume is hooked up to the tv and then the tv volume is up too high because the other box is turned down.if there is a unit hooked up,turn it's volume up ,and the volume on the tv down,otherwise the tv will amplify the residual noise.cheers,ed
If you have satellite, I am assuming you at least have a converter box hooked up. If so, make sure the converter box volume is set at its max. There may even be a volume setting in the converter menu that forces the volume output of the box to always be at full so that you don't get variations in audio when changing channels. Warning...before attempting this, please turn down the volume on your tv to at least the middle setting so you don't blow your tv speakers if this works.
No, one of your speakers is damaged (could be an amp channel went bad, but speaker is more likely). Unplug all spkrs, then plug one in and see if it acts normal when turned up. Repeat this until all speakers are hooked up or the culprit spkr is found.